Add init value and update_pattern to logictools pattern generator (#1195)
Add init value and update_pattern to logictools pattern generator (#1195)

Add initial value to setup()
Add experimental update_pattern() to allow pattern updates from numerical array
cathalmccabe/PYNQ,schelleg/PYNQ,Xilinx/PYNQ,cathalmccabe/PYNQ,cathalmccabe/PYNQ,cathalmccabe/PYNQ,Xilinx/PYNQ,cathalmccabe/PYNQ,schelleg/PYNQ,schelleg/PYNQ,schelleg/PYNQ,Xilinx/PYNQ,Xilinx/PYNQ,cathalmccabe/PYNQ,Xilinx/PYNQ,schelleg/PYNQ